Unpacking and Installation . 33
The Desiccant Indicator
The optical system of the spectrometer is purged at the factory. This protects the
beamsplitter and the sample compartment windows from being damaged by humidity.
Replaceable packs of desiccant keep the optics dry and free of CO
2
.
The top panel of the instrument includes a Desiccant Indicator, whose sectors change
sequentially from blue to pink as the desiccant packs are exhausted. Change the
desiccant in the instrument when the sector marked 10 becomes pink, but while the
sectors marked 15 and 20 are still blue. Refer to
Changing
the Desiccant on page 71
Refer to
The Desiccant Indicator in detail
on page 70 for more information about the
appropriate action to take if the sectors marked 15 and 20 are pink.
Figure 8 The Desiccant Indicator: When desiccant packs should be changed
CAUTION
If all three sectors of the Desiccant Indicator are pink, then you must
change the desiccant.
The instrument optics may be fogged. Do not switch the instrument
either ON or OFF until all sectors are blue.
NOTE: We recommend that you change the desiccant in the spectrometer before using it
for the first time. Refer to
Changing
the Desiccant on page 71.
Pink
Blue
Blue
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